51
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Analysis of glutathione adducts of patulin by means of liquid chromatography (HPLC) with biochemical detection (BCD) and electrospray ionization tandem mass spectrometry (ESI-MS/MS). Anal Bioanal Chem 2009; 394:1361-73. [DOI: 10.1007/s00216-009-2765-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 03/13/2009] [Accepted: 03/19/2009] [Indexed: 10/20/2022]
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52
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Highly efficient, selective and sensitive molecular screening of acetylcholinesterase inhibitors of natural origin by solid-phase extraction-liquid chromatography/electrospray ionisation-octopole-orthogonal acceleration time-of-flight-mass spectrometry and novel thin-layer chromatography-based bioautography. J Chromatogr A 2009; 1216:2519-28. [DOI: 10.1016/j.chroma.2009.01.061] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Revised: 01/07/2009] [Accepted: 01/19/2009] [Indexed: 11/18/2022]
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53
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Hsieh YH, Yang YH, Yeh HH, Lin PC, Chen SH. Simultaneous determination of galantamine, rivastigmine and NAP 226-90 in plasma by MEKC and its application in Alzheimer's disease. Electrophoresis 2009; 30:644-53. [DOI: 10.1002/elps.200800559] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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54
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Ptak A, El Tahchy A, Dupire F, Boisbrun M, Henry M, Chapleur Y, Moś M, Laurain-Mattar D. LCMS and GCMS for the screening of alkaloids in natural and in vitro extracts of Leucojum aestivum. JOURNAL OF NATURAL PRODUCTS 2009; 72:142-147. [PMID: 19117485 DOI: 10.1021/np800585c] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
HPLC coupled to a mass spectrometer (MS) was used for the analysis of galanthamine and lycorine in natural extracts of Leucojum aestivum and in their in vitro cultures grown with a precursor (ACC), inhibitors (AgNO(3), STS), or an absorber (KMnO(4)) of ethylene. The maximum galanthamine (0.002%) and lycorine (0.02%) concentrations in tissue cultures were obtained in the presence of KMnO(4). GCMS was used to investigate underivatized alkaloid mixtures from L. aestivum. Seven alkaloids were identified in in vivo bulbs. KMnO(4) led to the highest diversity of alkaloids in tissue culture extracts.
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Affiliation(s)
- Agata Ptak
- Department of Plant Breeding and Seed Science, Agricultural University, 31-140 Krakow, Poland
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55
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Xu Z, Yao S, Wei Y, Zhou J, Zhang L, Wang C, Guo Y. Monitoring enzyme reaction and screening of inhibitors of acetylcholinesterase by quantitative matrix-assisted laser desorption/ionization Fourier transform mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:1849-55. [PMID: 18789720 DOI: 10.1016/j.jasms.2008.07.025] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2008] [Revised: 07/05/2008] [Accepted: 07/30/2008] [Indexed: 05/09/2023]
Abstract
A matrix-assisted laser desorption/ionization Fourier transform mass spectrometry (MALDI-FTMS)-based assay was developed for kinetic measurements and inhibitor screening of acetylcholinesterase. Here, FTMS coupled to MALDI was applied to quantitative analysis of choline using the ratio of choline/acetylcholine without the use of additional internal standard, which simplified the experiment. The Michaelis constant (K(m)) of acetylcholinesterase (AChE) was determined to be 73.9 micromol L(-1) by this approach. For Huperzine A, the linear mixed inhibition of AChE reflected the presence of competitive and noncompetitive components. The half maximal inhibitory concentration (IC(50)) value of galantamine obtained for AChE was 2.39 micromol L(-1). Inhibitory potentials of Rhizoma Coptidis extracts were identified with the present method. In light of the results the referred extracts as a whole showed inhibitory action against AChE. The use of high-resolution FTMS largely eliminated the interference with the determination of ACh and Ch, produced by the low-mass compounds of chemical libraries for inhibitor screening. The excellent correlation with the reported kinetic parameters confirms that the MS-based assay is both accurate and precise for determining kinetic constants and for identifying enzyme inhibitors. The obvious advantages were demonstrated for quantitative analysis and also high-throughput characterization. This study offers a perspective into the utility of MALDI-FTMS as an alternate quantitative tool for inhibitor screening of AChE.
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Affiliation(s)
- Zhe Xu
- Shanghai Mass Spectrometry Center, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, Shanghai, China
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56
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Maciuk A, Moaddel R, Haginaka J, Wainer IW. Screening of tobacco smoke condensate for nicotinic acetylcholine receptor ligands using cellular membrane affinity chromatography columns and missing peak chromatography. J Pharm Biomed Anal 2008; 48:238-46. [PMID: 18187282 PMCID: PMC2605108 DOI: 10.1016/j.jpba.2007.11.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2007] [Revised: 11/16/2007] [Accepted: 11/19/2007] [Indexed: 11/23/2022]
Abstract
This manuscript reports an approach to the screening of natural product extracts for compounds which are active at membrane-bound receptors, ion channels and transporters. The technique is based upon cellular membrane affinity chromatography (CMAC) columns created through the immobilization of cellular membrane fragments on liquid chromatography stationary phases. In this study a CMAC(nAChR(+)) column was created out of membranes from a transfected cell line expressing the alpha3beta4 neuronal nicotinic acetylcholine receptor (nAChR) and the column was used to screen tobacco smoke condensates. A strategy involving parallel screening with a CMAC column created from a non-transfected form of the same cell line, CMAC(nAChR(-)) was adopted. The condensate was chromatographed on both columns, timed fractions collected and concentrated. Each fraction was analyzed on a C18 column in order to establish a chromatographic fingerprint of each fraction and a differential elution profile of each compound. Comparison of the elution profiles from the CMAC(nAChR(+)) and CMAC(nAChR(-)) columns identified patterns that could be associated with high affinity ligands and with low-affinity/non-binding compounds. Known strong ligands ((S)-nicotine, (R,S)-anatabine, N'-nitrosonornicotine), weak ligands ((R,S)-nornicotine, anabasine) as well as known non-ligands (N-methyl-gamma-oxo-3-pyridinebutanamide, (1'S,2'S)-nicotine 1'-oxide) have been identified in the complex extract. The results demonstrate that CMAC-based screens can be used in the identification of compounds within natural product extracts that bind to membrane-based targets.
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Affiliation(s)
- Alexandre Maciuk
- Gerontology Research Center, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Ruin Moaddel
- Gerontology Research Center, National Institute on Aging, National Institutes of Health, Baltimore, MD
| | - Jun Haginaka
- Mukogawa Women’s University, Nishinomiya 663-8179, Japan
| | - Irving W. Wainer
- Gerontology Research Center, National Institute on Aging, National Institutes of Health, Baltimore, MD
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57
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Schebb NH, Heus F, Saenger T, Karst U, Irth H, Kool J. Development of a Countergradient Parking System for Gradient Liquid Chromatography with Online Biochemical Detection of Serine Protease Inhibitors. Anal Chem 2008; 80:6764-72. [DOI: 10.1021/ac801035e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nils Helge Schebb
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische and Analytische Chemie, Corrensstrasse 30, 48149 Münster, Germany, and Vrije Universiteit Amsterdam, Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section Analytical Chemistry and Applied Spectroscopy, De Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands
| | - Ferry Heus
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische and Analytische Chemie, Corrensstrasse 30, 48149 Münster, Germany, and Vrije Universiteit Amsterdam, Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section Analytical Chemistry and Applied Spectroscopy, De Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands
| | - Thorsten Saenger
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische and Analytische Chemie, Corrensstrasse 30, 48149 Münster, Germany, and Vrije Universiteit Amsterdam, Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section Analytical Chemistry and Applied Spectroscopy, De Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands
| | - Uwe Karst
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische and Analytische Chemie, Corrensstrasse 30, 48149 Münster, Germany, and Vrije Universiteit Amsterdam, Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section Analytical Chemistry and Applied Spectroscopy, De Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands
| | - Hubertus Irth
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische and Analytische Chemie, Corrensstrasse 30, 48149 Münster, Germany, and Vrije Universiteit Amsterdam, Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section Analytical Chemistry and Applied Spectroscopy, De Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands
| | - Jeroen Kool
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische and Analytische Chemie, Corrensstrasse 30, 48149 Münster, Germany, and Vrije Universiteit Amsterdam, Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section Analytical Chemistry and Applied Spectroscopy, De Boelelaan 1083, NL-1081 HV Amsterdam, The Netherlands
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58
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59
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de Boer AR, Lingeman H, Niessen WM, Irth H. Mass spectrometry-based biochemical assays for enzyme-inhibitor screening. Trends Analyt Chem 2007. [DOI: 10.1016/j.trac.2007.08.004] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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60
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Irth H. Continuous‐Flow Systems for Ligand Binding and Enzyme Inhibition Assays Based on Mass Spectrometry. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/9783527610907.ch5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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61
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Abstract
A great number of natural products, especially alkaloids, which exhibit a range of biological activities including acetylcholinesterase inhibition and antineoplastic, cardiovascular and immunostimulatory activities, have been isolated from the plants of the Amaryllidaceae family. this review summarizes isolation, biological activity, and synthetic studies of these alkaloids. The primary biosynthetic pathways of each type of alkaloids are also proposed.
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Affiliation(s)
- Zhong Jin
- State Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, P. R. China.
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62
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Affiliation(s)
- R K Gilpin
- Brehm Research Laboratory, University Park, Wright State University, Fairborn, Ohio 45324-2031, USA
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63
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Greis KD. Mass spectrometry for enzyme assays and inhibitor screening: an emerging application in pharmaceutical research. MASS SPECTROMETRY REVIEWS 2007; 26:324-39. [PMID: 17405133 DOI: 10.1002/mas.20127] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Robust methods that monitor enzyme activity and inhibitor potency are crucial to drug discovery and development. Over the past 20 years, mass spectrometric methods have increasingly been used to measure enzyme activity and kinetics. However, for rapid screening of inhibitory compounds, various forms of fluorescence and chemiluminscence readout have continued to dominate the market. As the sensitivity, speed, and miniaturization of mass spectrometry methods continue to advance, opportunities to couple mass spectrometry with screening will continue to come to the forefront. To appreciate the tremendous potential for MS-based screening assays, it becomes necessary to understand the current state of capabilities in this arena. Thus, this review is intended to capture how mass spectrometry for studying enzymes activity has progressed from simple qualitative questions (i.e., is the product detected?) to quantitative measures of enzyme activity and kinetics and then as a tool for rapidly screening inhibitory compounds as an alternative to current methods of high throughput drug screening.
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Affiliation(s)
- Kenneth D Greis
- Genome Research Institute, University of Cincinnati, 2180 E. Galbraith Road, Cincinnati, Ohio 45237, USA.
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64
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Ooki Y, Kumemura M, Itoh M, Korenaga T. Inhibitory analysis of the effect of polycyclic aromatic hydrocarbons on the activity of chitinase by means of liquid chromatography-mass spectrometry of chitin oligosaccharides. Anal Bioanal Chem 2007; 387:2641-4. [PMID: 17325822 DOI: 10.1007/s00216-007-1157-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Revised: 01/24/2007] [Accepted: 01/26/2007] [Indexed: 10/23/2022]
Abstract
The analytical method of determining enzyme activity by liquid chromatography-mass spectrometry (LC/MS) was developed and applied for investigation of the effect of polycyclic aromatic hydrocarbons (PAHs) on the enzyme activity of chitinase. The measurement of chitinase activity by LC/MS is useful in order to use the nonderivatized substrate, which can show in vivo chitinase activity. Substrate consumption and product formation were monitored in order to determine chitinase activity. It was shown that, for the first time, in vitro addition of PAHs inhibited the activity of chitinase in a noncompetitive manner. The IC(50) value of benzo[a]pyrene was 1.4 microM, and PAHs containing four or more aromatic rings showed the same or higher inhibitory effect, whereas PAHs with a lower number of aromatic rings showed lower inhibition of the chitinase activity than benzo[a]pyrene.
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Affiliation(s)
- Yoriko Ooki
- Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan.
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65
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Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2007; 42:127-38. [PMID: 17199253 PMCID: PMC7166443 DOI: 10.1002/jms.1070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In order to keep subscribers up‐to‐date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of mass spectrometry. Each bibliography is divided into 11 sections: 1 Books, Reviews & Symposia; 2 Instrumental Techniques & Methods; 3 Gas Phase Ion Chemistry; 4 Biology/Biochemistry: Amino Acids, Peptides & Proteins; Carbohydrates; Lipids; Nucleic Acids; 5 Pharmacology/Toxicology; 6 Natural Products; 7 Analysis of Organic Compounds; 8 Analysis of Inorganics/Organometallics; 9 Surface Analysis; 10 Environmental Analysis; 11 Elemental Analysis. Within each section, articles are listed in alphabetical order with respect to author (6 Weeks journals ‐ Search completed at 4th. Oct. 2006)
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66
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Screening of acetylcholinesterase inhibitors in snake venom by electrospray mass spectrometry. PURE APPL CHEM 2007. [DOI: 10.1351/pac200779122339] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
An electrospray ionization/mass spectrometry (ESI/MS)-based assay for the determination of acetylcholinesterase (AChE)-inhibiting activity in snake venom was developed. It allows the direct monitoring of the natural AChE substrate acetylcholine (AC) and the respective product choline. The assay scheme was employed in the screening for neurotoxic activity in fractions of the venom of Bothrops moojeni. AChE inhibition was assessed in two fractions. As a positive control, the established AChE inhibitor 1,5-bis(4-allyl-dimethylammoniumphenyl)pentan-3-one dibromide (BW284c51) was used, a dose-response curve for this compound was generated and the IC50 value for the inhibitor was determined to be 1.60 ± 0.09 × 10-9 mol L-1. The dose-response curve was used as "calibration function" for the venom inhibition activity, resulting in BW284c51-equivalent concentrations of 1.76 × 10-9 mol L-1 and 1.07 × 10-9 mol L-1 for the two fractions containing activity. The ESI/MS-based assay scheme was validated using the established Ellman reaction. The data obtained using both methods were found to be in good agreement. The ESI/MS-based assay scheme is therefore an attractive alternative to the standard colorimetric assay.
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